VM: Replace dart --noopt with new binary target dart_noopt.

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index fd67ebf12285386a679b0a18f4565398e71d86de..7b36c5f7563714c8fe7c13dea7dcf2e1a4d47d01 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -212,6 +212,21 @@ abstract class TestSuite {
     return dartExecutable;
   }
 
+  String get dartVmNooptBinaryFileName {
+    // Controlled by user with the option "--dart".
+    String dartExecutable = configuration['dart'];
+
+    if (dartExecutable == '') {
+      String suffix = executableBinarySuffix;
+      dartExecutable = useSdk
+          ? '$buildDir/dart-sdk/bin/dart_noopt$suffix'
+          : '$buildDir/dart_noopt$suffix';
+    }
+
+    TestUtils.ensureExists(dartExecutable, configuration);
+    return dartExecutable;
+  }
+
   String get dartPrecompiledBinaryFileName {
     // Controlled by user with the option "--dart_precompiled".
     String dartExecutable = configuration['dart_precompiled'];